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Abstract

We demonstrate a room-temperature operation of the near-infrared femtosecond optical parametric oscillator based on MgO-doped stoichiometric periodically-poled lithium niobate, which is synchronously pumped by a Kerr-lens mode-locked Ti:sapphire laser. Wide tunability in the range from 0.98 µm to 1.50 µm was enabled for a single set of cavity mirrors by incorporating a BK7 window as an output coupler. For the output coupling ratio of 3.7%, the threshold pumping power of 460 mW and the slope power conversion efficiency of 37% were achieved. By controlling dispersion values with intra-cavity prisms, femtosecond pulses as short as 66 fs could be obtained.

(a). Signal spectrum obtained for different pump wavelengths for a poling period of Λ=20.8 µm at room temperature. (b). Signal and calculated idler wavelengths and calculated tuning curve for the signal and the idler with a QPM period of Λ=20.8 µm at room temperature.

The signal output power as a function of the signal wavelength which is continuously tunable by adjusting the cavity length and changing the pump wavelength. The inset shows the signal power as a function of pump intensity for fixed signal and pumping wavelengths of 0.792 µm and 1.225 µm, respectively.

The output pulse spectrum ((a), (c), (e)) and cross correlation intensity as a function of time delay ((b), (d), (f)) for the case of transformed limited, negative dispersion, and positive dispersion. The insets of Fig. 4(a), 4(c), 4(e) depicts the change of the signal wavelength as a function of cavity length displacement.